Prof. Rösch's research focuses on the development and application of quantum chemical methods that are used to solve a wide range of chemical and physical questions. Complex systems are investigated, such as metal clusters, adsorbates on metal and oxide surfaces as well as in zeolite cavities, heterogeneous and homogeneous catalytic reaction systems as well as actinoid complexation and sorption. In addition, the company's own density functional program ParaGauss has been developed since 1994 with a focus on relativistic density functional methods and embedding methods for systems on surfaces and in solution.